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How antibodies access neurons to fight infection

Date:
May 18, 2016
Source:
Yale University
Summary:
Scientists have solved a puzzle of the immune system -- how antibodies enter the nervous system to control viral infections. Their finding may have implications for the prevention and treatment of a range of conditions, including herpes and Guillain-Barre syndrome, which has been linked to the Zika virus.
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A cross-section of mouse dorsal root ganglia stained for memory CD4 T cells (green) and the vascular cell adhesion molecule, VCAM-1 (red) after six days of genital herpes challenge.
Credit: Norifumi Iijima

Yale scientists have solved a puzzle of the immune system -- how antibodies enter the nervous system to control viral infections. Their finding may have implications for the prevention and treatment of a range of conditions, including herpes and Guillain-Barre syndrome, which has been linked to the Zika virus.

Many viruses, such as West Nile, Zika, and the herpes simplex virus enter the nervous system, where they were thought to be beyond the reach of antibodies. Yale immunobiologists Dr. Akiko Iwasaki and Norifumi Iijima used mice models to investigate how antibodies could gain access to nerve tissue in order to control infection.

In mice infected with herpes, they observed a previously under-recognized role of CD4 T cells, a type of white blood cell that guards against infection by sending signals to activate immunity. In response to herpes infection, CD4 T cells entered the nerve tissue, secreted signaling proteins, and allowed antibody access to infected sites. Combined, CD4 T cells and antibodies limited viral spread.

"This is a very elegant design of the immune system to allow antibodies to go to the sites of infection," said Iwasaki. "The CD4 T cells will only go to the site where there is a virus. It's a targeted delivery system for antibodies."

The implications of the finding are multiple. Without CD4 T cells, antibody-based therapies that are being developed for conditions like herpes may not be sufficient to control infection, Iwasaki noted. Conversely, for antibody-mediated autoimmune diseases such as Guillain-Barre, "it may be beneficial to block CD4 from entering the neuronal tissues," she said.


Story Source:

Materials provided by Yale University. Original written by Ziba Kashef. Note: Content may be edited for style and length.


Journal Reference:

  1. Norifumi Iijima, Akiko Iwasaki. Access of protective antiviral antibody to neuronal tissues requires CD4 T-cell help. Nature, 2016; DOI: 10.1038/nature17979

Cite This Page:

Yale University. "How antibodies access neurons to fight infection." ScienceDaily. ScienceDaily, 18 May 2016. <www.sciencedaily.com/releases/2016/05/160518133822.htm>.
Yale University. (2016, May 18). How antibodies access neurons to fight infection. ScienceDaily. Retrieved February 21, 2017 from www.sciencedaily.com/releases/2016/05/160518133822.htm
Yale University. "How antibodies access neurons to fight infection." ScienceDaily. www.sciencedaily.com/releases/2016/05/160518133822.htm (accessed February 21, 2017).